This summer I’ve been busy with my GSoC project, which involved making columns sortable on list-type screens in the WordPress administration area. Yesterday, that work was included in trunk, so if you’re on the bleeding edge (3.1-alpha), you should see something like this:

That’s all very nice, you say, but how do I make sortable columns of my own? First, let’s make a plain, old, non-sortable column: